在我的适配器中使用动画时,我有问题.
@Override
public View getView(int position,View convertView,ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = LayoutInflater.from(context);
convertView = inflater.inflate(resource,parent,false);
holder = new ViewHolder();
holder.newRoomView = (TextView) convertView.findViewById(R.id.newRoom);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Room item = items.get(position);
// animate new rooms
if (item.isNewRoom()) {
AlphaAnimation alphaAnim = new AlphaAnimation(1.0f,0.0f);
alphaAnim.setDuration(1500);
alphaAnim.setAnimationListener(new AnimationListener() {
public void onAnimationEnd(Animation animation) {
holder.newRoomView.setVisibility(View.INVISIBLE);
}
@Override
public void onAnimationStart(Animation animation) {}
@Override
public void onAnimationRepeat(Animation animation) {}
});
holder.newRoomView.startAnimation(alphaAnim);
}
// ...
return convertView;
}
在适配器外面添加一个新房间并调用notifyDataSetChanged新房间是正确的动画,但是当onAnimationEnd被调用时,另一个(不是新的房间)被隐藏.
有什么办法可以隐藏正确的房间吗?
解决方法
由于您尚未在getView()方法中声明持有人变量,我只能假设您已将其声明为类中的实例变量.这是你的问题.在动画完成时,变量持有人持有对完全不同的项目的引用.
您需要使用在getView()方法中声明为final的局部变量.我不知道在getView()方法之外是否需要这个持有者变量,但如果你这样做,你可以这样做:
// animate new rooms
if (item.isNewRoom()) {
final ViewHolder holdercopy = holder; // make a copy
AlphaAnimation alphaAnim = new AlphaAnimation(1.0f,0.0f);
alphaAnim.setDuration(1500);
alphaAnim.setAnimationListener(new AnimationListener() {
public void onAnimationEnd(Animation animation) {
holdercopy.newRoomView.setVisibility(View.INVISIBLE);
}
@Override
public void onAnimationStart(Animation animation) {}
@Override
public void onAnimationRepeat(Animation animation) {}
});
holder.newRoomView.startAnimation(alphaAnim);
}
这当然是不行的,如果动画需要这么长的时间,视图已被回收利用在此期间.